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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786b2a46db4d2152e11a503fea92ce0cc381f655d15a0f98cb2acbdc4d439f1c' 
  AND token = 'qi68jng/zvaQz5hARlsksMybUja5Jl/trlm66ix8JVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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