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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc4d48196eb53e14acc40c94e2dbf8039bb6e1912d839e60e099c32f485a88f' 
  AND token = '82Q0CSBJrEuGsDopc0Q6W8I3y6D6uwqFBSh/FQb0/SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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