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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf671ce9dd5cf543bd341b024897dc82fd2a61c939c0260dd3ce418993e09cb' 
  AND token = 'B5ypB6KW4g9Pa6O8ApJvqnApY4z+q7kepWHVrJ4cTKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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