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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa5ce06b3dc6c09caa8d2243ac73fc34d607340d8ffce84bcdb314d780e2140' 
  AND token = 'BY472aDNUvbX+wsbd7mKbmhH5dmZxG7PUa8zmmZ0K00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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