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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0eaa9affef1e8f933265fef9a2377e2dbb9dba02ad3efaa5b3ef56b94c79bce' 
  AND token = 'SCMTWveOigpkH59ZiOjfB9le4gnjQ05MFCO0afTyZ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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