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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f628cc794667fa64f8a630342425851139c1bb16dc3909a2a1b568e0df07fe' 
  AND token = '7pVraORrcArSfScgOu+k468q3kY5dOO0ZP8JXMbU9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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