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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd05f397e609420d7736e3e61e49586e41e4c8b9e7176c38470c913cccdce3a3' 
  AND token = 'RsUovyne1u9LNS77rHzD/NjtV4S8GE3JL616+gi3TEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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