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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0ef4f2961000830a77a522f204c07409b8f3472db52053417d40e0b3906d1d' 
  AND token = 'SEyeTB7u5XB+Xwtxf6uMSA/4Cfbqm4RiPP2yn73FI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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