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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dd25e3043496cdb4d50e84d3ee4ef04d78c28927f0a8efc7fcd96c0189542b' 
  AND token = 'pTeycRLGQ0RIXyHySa2VyEGIRzkXI7eDrFSF3s5yQgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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