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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15103c759223c8d4ae4cd247979479061c84dcbd2f343e3c6a443633472b017c' 
  AND token = 'oO6ho9XIr0FHef1SBT9ufrlw1qkxUW/9kpfuz4iar8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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