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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32346310fa4ca59ecda673134dbf222defc6f57a0dcd6dc8893ad937127b9e70' 
  AND token = 'w4ZNpXXejWYB40UYxR4l/GuXAZdcWkkD3kt4uh67JSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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