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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d841e08edb62d19ed3a61e05adff83e3671f13486cf8388987fa292ac1fc34' 
  AND token = 'u95d9Cn4hT47M+K8kJxp7CgezhuYPGCx63aNsdSxEx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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