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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7bc3f849a7cf637042517ddcd0c00c9d3df3d206ae1963b7b060a481f763c5' 
  AND token = 'MEAsHXHwT4NvkGdDZFsQ5/wC3yyEMZxBsLXRRDp1FHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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