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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67b553c9f04764c642af5760af514cf7e98c0a87cca128f4ccae95a1b6b86cd' 
  AND token = '5+rqcYrqBcs1Y+oneRSF/1RgwUVKEYR+rWRuldTn3GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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