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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5ce310c92cf3fa156add66768654e3372ab1b9049cb2c52a189c724ea22b25' 
  AND token = '9y55htWbnEzKhyveC1wIJAFIIkNhJBhwPh9bzmhtmk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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