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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef6f9ba7e92823a536d0757741eccd1ba1f479f13717557a13ff5b8a7ad1c09' 
  AND token = 'P6hrdSYRa9pMSa3D5BL7tVlkv+QgVoHge4Dk159eato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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