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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd327fbc9b5e9e45d8cf998ba5f69a333035a0f6a0fd09fafb7f4f97fa08ee14' 
  AND token = 'HeaghR2Nu9w8qR00DQEb1krEcYUJhaBf5oTqtyoJfks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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