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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6447909271c9d3c0d03e2b3aadab7e47a48dd69bdb344b064bacc112e2a90eb6' 
  AND token = 'dTJiLAXg2pOmq4PmhxdV5YHAsmr/ybMM9M6LYecJS5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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