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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10f63513db9c8c29f16e6510f66c42467f70beee506908a2476f58fb71df10c' 
  AND token = 'zz5kXUxMvPk2iUkffMsTnF+RJK0k8gpBEWdQqUkrjdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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