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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84acd630963cb6e3563bf7598064eea33e2eb32d734a2d3e6ed9c8495464aa50' 
  AND token = 'GROPijjmPLFpM2VX37wLUfqBxeqwnuTCbeybhDXnW8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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