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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de682d5746180a161b9c218a25ec3eefd89674039c5995b86596430c1d1a026' 
  AND token = 'bOXW2WYTort0qfm+0Qvpd1j2bhHepTGoW5rEBQ0eOrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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