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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45efbe3019736d9045a849120579be55ebe4440284a0b7b99aba432b332b8a4a' 
  AND token = 'X1UPK6MmrF0/LYCOS+/c85bhpE2mze1YItEfj7AwJVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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