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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173336a17bdcaa1ba9334e9b35836d21dbb05d61bd145913be35c69080bccb62' 
  AND token = 'oRszq++qeuth1IjZ+rXvIuwucm7mUPW+qkK6nlCws8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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