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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9a1bc3cb75a25f3cb8837b2a63be22986a5eb1e501b1d6c0410fb13ad4ab03' 
  AND token = '2v27zK3V8It1zStYZecmIYWuxTcucvbm5gElDeMKnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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