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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2782aaff890d54c5b03c06eb848631932f4636217602b5e881006edbd91b30bd' 
  AND token = 'Kbdv5DX67GG/86Sl2ncXJ0zEEr28hUVSHmQXDHSRTo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}