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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e63f1a2a81fcf33736dcfe797933839b516ae4f27574d47e38f1db3ef325e1' 
  AND token = 'rYJ4DVDFTCOHQICgxahXi1RT22ZcgA7g0Np5A/ppdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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