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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72c067c2718f5c9f1519ce7567ef011effb7201968d4b99107172110b20125a' 
  AND token = 'MZ2GqFK953glktSFD4axyJnW5TBWSsXekRe08HYz0U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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