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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34a87403c63e8f21a2046513ef35470a3b3edf6b59802cce2eed1ba2bbbffd5' 
  AND token = 'bXW1GFmKuTzMN0ujU4EWTGYN1OMSSWCU5o9yuHe/Zsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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