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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1c1987cb99dd38d56db9b69c3b798cb8c9e8eaa01844cc7624f1d95fa3698e' 
  AND token = 'm5ZqMOPFEgvgqRGnzsKAamI1cqPgdzdwu1jSRuHvqXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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