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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7cb5699ef2a6067fb6d3b7b7f8f485a6c00fa6254eb2c1a1dace91b1eef540' 
  AND token = 'g+cmae3pFyKe8EXWcroIcFf957RoJgeA67a7XdR025M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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