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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66990e99fb7e6a68161e2cad8126f875dde868998f3fcbbef73edf3bea7a7526' 
  AND token = 'kPX8X9XM79XoBhQw0wlBqF9WBX3KdZz9a1ApQdlpLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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