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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1d633ece034c533566be1f9c0ac6843d1f9799ca1a5eea07d0879a4b038a7d' 
  AND token = 'CorNaOfHzbs2oyqnAU00pfUck3BbhFmrLgHjAuKTYmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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