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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6eb028410f9781ca938cc35491f13467c06377d5e485f7aa891d558f6680fb' 
  AND token = 'tFDR7bNxuzuw2ZphKJIaFCfS5J/DH64de+IviP64z60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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