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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562da23bc4389886ad695b9feb0085188f98ac25006e9df2401a16b267703132' 
  AND token = 'iJcoXHBEXB7tqC1324j8SMV1qGcvrCwVdWWcDPs7p+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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