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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a2a72fbddb3729d811680cde167ee2d2608c495d5dc9e0fae75fc176def4e9' 
  AND token = 'FsBgpWfd43+RC3LrGfX/D5jE6/roJ01DwoHc7UQ/ZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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