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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c41c34ce136436ac50ffd3247bb3f9284815a6b97c2995f3238fb85528d836c' 
  AND token = 'nMfbjJ9LiIQr5Q+xmuQjWzbTo9Yyl64L3plUpmR3/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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