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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46456eb200c6f3848f23b015a2ff7a776582e83f31331d4e7783382162dcca06' 
  AND token = '4uwwqe6RalqRB/RVzfxL5SnQgCy8+cnxo43frge2R2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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