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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a979a5dba892738bcdd7425282dc65f4d6c51495c066546891de56970c2b8e1a' 
  AND token = 'ZutWTntUf3nrNNYARDE3730UKzDcH1vQBsXZ9EEBFrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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