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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e86e043b7a26a67d9878553157cbfdad7b1590aa37893dd996c654f2ab1532' 
  AND token = 'UIV+ON62ul2XEXcutvWV40fCPpVbCRI4FD3lirCRXlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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