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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a750b428bf25706901eda98ecacb3bc6b556d06b5358d7ef873d836d14ebff' 
  AND token = 'F1jo8EJMC8LtgFu5Auw0nyNdNHo6yV2AAHD6EUkOc8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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