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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35993af62fc109ff00264dc7087b7f76df5c3f0b559c9a2d956cbe3607dc9e1b' 
  AND token = 'E9h/viidqiH+j3nuxw9vEYj/35muuKZaDm2wm3REEW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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