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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ae4aa3e72b021466095e1f696be493f6acbfff07d997dbe481bb552ce74575' 
  AND token = 'DninkLPxd/KRF3qop+XyuqNI1Z5ma/ma7GXO36bthuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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