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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3069c4704b4188e3d581e36bac6b1d2bb924c774d1e548b30a578755c56d23e' 
  AND token = 'rM/mFX4BRcBxQU8NT6x6Aecjin2Vd3rFqgrJqBBDh6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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