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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efeafcc54ea878a5f8040284101b8f2a9288e6799043021a26624ea527ffbfd' 
  AND token = 'rJepvIiOrBJ1Tz46pyo5tAWQ1Jp55EMYz0zlzPBE6jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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