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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f001d584555644e5e5d491ac0a502bcd2b52ed6e7b876085d6d33f5e3dbd7d' 
  AND token = 'FW+YM64yP6xhjVb9A1ef5kOjMZ0IVtmlBX44JzQPcgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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