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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0410a79e2c3e0587f11706c92497a09c9c49219a4224c3c3a5abb5e4843b94a' 
  AND token = 'JnpeKQuCjoIA1rtrvHwuRtmLo/JphNTP95hJWvogdHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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