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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae9a5d2e8787409779408a6502cb5a5bfdac56dd5f05a49a3d063dd5c4252b8' 
  AND token = '+7URjQqVzAOSWxVox4nIr/l37JYy09Yuyq2WoAJNymE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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