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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd40b2085b58c49cef09beb3f783c98c463342bf7aab6b9b79f393af6a1db65f' 
  AND token = '6Vx/k2zHvD78PNAZwcmoi7+pYea9VT2wY4cZoWUP/nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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