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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8c5503f8917338d475c070371f2df797b932570d29aad70acedfbe600d5e8e' 
  AND token = '+qbjs5btl8DLusJPI6zf7idRcSLSzzd9RDGhdXdasKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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