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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abe63bfdf2892a2d06365ac24361544d3e512e756c234eb431a4a7affb17fc7' 
  AND token = 'DCB4BE/MHcT8ohrmu6edbtQx/3Vyc5p3NJjQy3NrOzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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