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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a978c832a92a78868259d7a9f9b945309773763e881fb15231c76594c4481d' 
  AND token = 'ZorCdfeZvbfEseByLQqPtomblG3kpykaNCI+mvEVFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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