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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92309d7ab5cd1c2d2927e22b9bf909a633a61c11c10b263ef6542834f32c9fe' 
  AND token = 'txB8gbFnTb3Y2e0CAGbhrRAb+0E/Zku41egjRa1m0UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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