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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736d703a9dc92aac4058e07d598aac68f26e6d8a2464d9d752896c2f43a2f6cd' 
  AND token = 'w1oBGVWaVl8z7K5GkB0q4a0zQgu1VoLiuwzfqbTl2RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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