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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c9e52ecc745df5edb94268427ca1f1e95402f483952c3b74d7f311db7cb16e' 
  AND token = 'RwjorLMA5VCW0yWHSLjPdi71pWj9/UweunJAut2u58g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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