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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa17adc35f7f0c1da9b2ba59ad2c652b45e64c4e7a25d9aa5ae81908b111c9e6' 
  AND token = '9JySKFP9s403qw5uRnyxYQ/OsFP+j2dvhEyaQkuv7Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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