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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7929ce4463bcd6513b575009c62efdfb625fd5f5cd69655c44e1efac31192f2' 
  AND token = 'atQ8Th6eCXb3qZblC3RNX69YpXmu7x62SlPzzUdT/IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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