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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192ee5639a1ea1e0c31c134d2eebe0f986c34b0a86a6460809aecd0fac4df5c0' 
  AND token = 'paITCbihtLh+FuxYTmatphr0wrY1R9h3bGuGdRN7A8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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