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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d2b75dc26dbf23e234b9ee7458463cc7b44cb015069c73c9ebc8aebbb07a73' 
  AND token = 'R0Z3C9glwgz6bc6Jh6Wz3OStpGRwwfeGJst+4ymImGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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