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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3436f6eb6989229db3706b0c64d5c7ba736cae71ee5cadc744b010074b6a1f7' 
  AND token = 'blhtleaKUfuNWwXqaemeT2R3H3I1CSelpGR+rDhRTcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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