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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f198002d614d58856bca3ac0d85c8d6f2ab573c1954f2c12f669b76394e0a172' 
  AND token = 'RzuGLSKEsNDR28PoTw0LDPm51XtJZs8Ay+zkq1J8/wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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